// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_WASM_WASM_FEATURES_H_
#define V8_WASM_WASM_FEATURES_H_

// The feature flags are declared in their own header.
#include "src/base/macros.h"
#include "src/wasm/wasm-feature-flags.h"

// All features, including features that do not have flags.
#define FOREACH_WASM_FEATURE FOREACH_WASM_FEATURE_FLAG

namespace v8 {
namespace internal {
    class Isolate;
    namespace wasm {

#define COMMA ,
#define SPACE
#define DECL_FIELD(feat, desc, val) bool feat = false;
#define JUST_TRUE(feat, desc, val) true
#define JUST_FALSE(feat, desc, val) false
#define DECL_PARAM(feat, desc, val) bool p##feat
#define DO_INIT(feat, desc, val) feat(p##feat)

        // Enabled or detected features.
        struct WasmFeatures {
            FOREACH_WASM_FEATURE(DECL_FIELD, SPACE)

            constexpr WasmFeatures() = default;

            explicit constexpr WasmFeatures(FOREACH_WASM_FEATURE(DECL_PARAM, COMMA))
                : FOREACH_WASM_FEATURE(DO_INIT, COMMA)
            {
            }
        };

        static constexpr WasmFeatures kAllWasmFeatures {
            FOREACH_WASM_FEATURE(JUST_TRUE, COMMA)
        };

        static constexpr WasmFeatures kNoWasmFeatures {
            FOREACH_WASM_FEATURE(JUST_FALSE, COMMA)
        };

#undef JUST_TRUE
#undef JUST_FALSE
#undef DECL_FIELD
#undef DECL_PARAM
#undef DO_INIT
#undef COMMA
#undef SPACE

        static constexpr WasmFeatures kAsmjsWasmFeatures = kNoWasmFeatures;

        V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromFlags();

        // Enables features based on both commandline flags and the isolate.
        // Precondition: A valid context must be set in {isolate->context()}.
        V8_EXPORT_PRIVATE WasmFeatures WasmFeaturesFromIsolate(Isolate* isolate);

        V8_EXPORT_PRIVATE void UnionFeaturesInto(WasmFeatures* dst,
            const WasmFeatures& src);

    } // namespace wasm
} // namespace internal
} // namespace v8

#endif // V8_WASM_WASM_FEATURES_H_
